k/n |  1  2  3  4  5  6  7  8  9 10 11 12 13 14 15 16 17 18 19 20 
===================================================================
   1 |  1  1  1  1  1  1  1  1  1  1  1  1  1  1  1  1  1  1  1  1 
   3 |  1 -1  0  1 -1  0  1 -1  0  1 -1  0  1 -1  0  1 -1  0  1 -1 
   5 |  1 -1 -1  1  0  1 -1 -1  1  0  1 -1 -1  1  0  1 -1 -1  1  0 
   7 |  1  1 -1  1 -1 -1  0  1  1 -1  1 -1 -1  0  1  1 -1  1 -1 -1 
   9 |  1  1  0  1  1  0  1  1  0  1  1  0  1  1  0  1  1  0  1  1 
  11 |  1 -1  1  1  1 -1 -1 -1  1 -1  0  1 -1  1  1  1 -1 -1 -1  1 
  13 |  1 -1  1  1 -1 -1 -1 -1  1  1 -1  1  0  1 -1  1  1 -1 -1 -1 
  15 |  1  1  0  1  0  0 -1  1  0  0 -1  0 -1 -1  0  1  1  0  1  0 
  17 |  1  1 -1  1 -1 -1 -1  1  1 -1 -1 -1  1 -1  1  1  0  1  1 -1 
  19 |  1 -1 -1  1  1  1  1 -1  1 -1  1 -1 -1 -1 -1  1  1 -1  0  1 
  21 |  1 -1  0  1  1  0  0 -1  0 -1 -1  0 -1  0  0  1  1  0 -1  1